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It means the uppercase letter function is enabled. go onto dells home page and you should be able to find some info on how to turn it off. On my latitude laptop it is one of the f1 to f12 keys Don't have my laptop with me so not sure which one. Give that a try on yours

Go to Start > Control Panel > System > Hardware > Device Manager. In there you should see the drivers that are not installed marked with a yellow symbol. Right click on them and click install or update.

Here's where to get the drivers if it doesn't find them by itself:http://support.euro.dell.com/support/downloads/index.aspx?c=uk&cs=ukdhs1&l=en&s=dhs&~ck=GuidedPathHomePage

On the back of your dell is a service tag. Copy it down and go to ww.dell.com and Support and drivers, input your service tag and it will give you the original configuration of hardware and software installed on your computer.

This link to Dell's support site should help you figure out how to open the case whether it is a tower or desktop. This article comes with images and will show you everything from the assembly/disassembly of the cover, front panel, drive cage, motherboard, CPU, etc.